etd 
ON THE VEGETATION OF DITCHAM PARK, HAMPSHIRE. _{! 267 
Calcareous coppice, both with standards of beech and ash and 
without. 
(ii) On clays.—Coppiced woods, showing transition stages from cal- 
careous coppice where the soil is thin to coppiced woods with good oak 
standards and hazel or ash coppice, and many non-calcareous elements 
in the vegetation, such as Pteridium and Holcus mollis. 
Grassland on clay with local patches of heath grassland, and to a 
very limited extent of heath. 
Special attention has been paid to natural regeneration of beech 
woods. Large quantities of fruit were produced in 1912, and the fate 
of the seedlings is being watched and investigated. 
Two areas where beech wood and chalk scrub adjoin chalk grassland 
have been fenced in to exclude rabbits and are receiving special attention. 
Very considerable differences are observable on the two sides of the 
fence ; the most striking being the height of the pasture plants. Outside 
the turf is cropped like a lawn, while inside, in June, there was a 
luxuriant growth averaging 12 to 18 inches in height. 
Of more experimental work special attention has been paid so far 
to evaporation. A large series of evaporimeters has been established 
in selected parts of the woods and readings taken regularly. Tempera- 
ture and humidity (by wet and dry bulb thermometer) are also being 
recorded along with the evaporation. Very considerable differences 
of evaporation, accompanied by changes in the ground vegetation, have 
been noted in beech woods at different levels of the chalk escarpment 
and on the tops of the hills. 
Preliminary investigations have also been carried out on the light 
intensity and on the different soils, which will be pursued in more 
- detail in the immediate future. 
Botanical Photographs.—Report of the Committee, consisting of 
Professor F. W. OLiIver (Chairman), Professor F. E. WEISS 
(Secretary), Dr. W. G. SmirH, Mr. A. G. TanszeEy, Dr. 
T. W. WoopHEAD, and Professor R. H. Yarp, for the Registra- 
tion of Negatives of Photographs of Botanical Interest. 
Owine to the small demand made for the loan of negatives of 
botanical interest, due, no doubt, to the large number of photographs 
and lantern slides available from various dealers, the Committee con- 
siders that it is unnecessary now to continue its labours. It recom- 
‘mends that all prints of ecological interest should be handed to the 
newly founded Ecological Society, and that all other prints should be 
housed in the Botanical Department of the University of Manchester, 
where they will continue to be available for further reference. It 
considers, however, that the Committee might now be dissolved. 
